A low-cost airline / carrier (LCC) also known as a no-frills, discount or budget airline, is an airline that generally has lower fares and fewer comforts. To make up for revenue lost in low cost ticket prices, the airline usually charges extra for food, baggage, priority boarding, seat allocating. Examples are EasyJet, Ryanair.
Further data definitions can be found in the glossary, available to both Fleets and Values Analyzer users. The glossary can be accessed via the link on the black header bar; either search for a specific term, or use the alphabetic index to quickly navigate to the required definition.